#include<stdio.h>
int main(void)
{ int n,a,k,b;
   scanf("%d",&n);
   scanf("%d",&a);
   scanf("%d",&k);
 if(n>0&&a<=100&&k<=100&&n>=2)
 {
 b=a+(n-1)*k;
 printf("%d",b);
 }
 else
 printf("Wrong Number");
 return 0;
 } 
